COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY
SCHEDULE OF AIRWORTHINESS DIRECTIVES
Eurocopter AS 355 (Twin Ecureuil) Series Helicopters
AD/AS 355/28
Amdt 2
Installation of Automatic Relighting System 4/88
DM
All model AS 355 E, F, F1 and F2 Helicopters.
Install the automatic relighting system (for Allison 250 C20F engine) in accordance with the mandatory requirement of Aerospatiale SB 01.18 Rev 2 and accomplishment instructions detailed in Aerospatiale SB 80-02 Rev 2 or other equivalent system acceptable to the Secretary.
DGAC Bureau Veritas AD 86-153-031 (B) R4 Part B refers.
For helicopters in IFR and VFR operations prior to further flight after 31 March 1988.
The operating limitations detailed in AD 86-153-031 (B) R4 Part A (a) and (b), now incorporated in the Australian Flight Manual, are cancelled on completion of the automatic relight system installation.
Compliance with the previous issue of this Directive does NOT satisfy Compliance with this Amendment 2.
Several cases of single and two cases of double-engined flameout have been reported one of which resulted in a fatal accident. These incidents occurred in IMC and VMC but always in high humidity with OAT near zero degrees Celsius. Country of Origin AD 86-153-031 (B) R2 publishes the mandatory requirement to embody an automatic relight system for these a/c in both IFR and VFR operations. This Directive is issued to ensure an automatic relight capability prior to the onset of the 1988 Australian winter when conditions conducive to engine flame-out are most likely to be experienced.
This Directive is amended to reflect Rev 2 to SBs 01.18 and 80.02 and to reference
D.G.A.C. Bureau Veritas AD 86-153-031 (B) Rev 4 which incorporate complimentary modifications 350A07-1910 and 1920 to prevent inadvertent operation of the system.